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B - Mg
C - 2 HCl
D - S
E - CuCl₂
1. Cl₂ + H₂ -->2 HCl
2. Mg + 2 HCl --> MgCl₂ + H₂
3. H₂ + S --> H₂S
4. 2 HCl + CuS --> CuCl₂ + H₂S
5. Br₂ + H₂ --> 2 HBr